He is married to Constance OF HUNGARY.
They got married
Child(ren):
Lev I of Galicia (Lev Danylovych), (born ca. 1228, died ca. 1301) became in turn Knyaz of Belz (1245 - 1264), Knyaz of Peremyshl and king of Halych (1264 - 1269) and King of Galicia-Volhynia (1293 - 1301).
He was a son of King Danylo of Galicia and his first wife Anna of Novgorod. His maternal grandparents were Mstislav the Bold and an unnamed daughter of Kotian, Khan of the Cumans.
Reign
Lev moved his father's capital from Halych to the newly-founded city of Lviv. This city was named after him by its founder, Lev's father King Danylo. In 1247 Lev married Constance, daughter of Béla IV of Hungary. Unlike his father, who pursued a Western political course, Lev worked closely with the Mongols and together with them invaded Poland. However, although his troops plundered territory as far west as Racibórz, sending many captives and much booty back to Galicia, Lev did not ultimately gain much territory from Poland. Lev cultivated a particularly close alliance with the Tatar khan Nogai. Lev also attempted, unsuccessfully, to establish his family's rule over Lithuania. Soon after his brother Shvarno ascended to the Lithuanian throne in 1267, Lev organized the murder of Grand Duke of Lithuania Vaiésvilkas. Following his brother Shvarno's loss of the throne in 1269, Lev entered into conflict with Lithuania. From 1274-1276 he fought a war with the new Lithuanian ruler Traidenis but was defeated, and Lithuania annexed the territory of Black Ruthenia with its city of Navahrudak. In 1279, Lev allied himself with king Wenceslaus II of Bohemia and invaded Poland, although his attempt to capture Krakiv in 1280 ended in failure. That same year, however, Lev defeated Hungary and annexed part of Transcarpathia, including the city of Mukachevo. In 1292 he defeated Poland and added Lublin with surrounding areas to the territory of Galicia-Volhynia. At the time of Lev's death in 1301 the state of Galicia-Volhynia was at the height of its power.
Leo I married Constance of Hungary. She was a daughter of Béla IV of Hungary and Maria Laskarina. They had three children:
Yuri I of Galicia (24 April 1252/1257 - 18 March 1308).
Svyatoslava of Halych (d. 1302). A nun
Anastasia of Galicia (d. 12 March 1335). She married Siemowit of Masovia who was a son of Casimir I of Masovia and his third wife Euphrosyne of Opole.
Source: Wikipedia
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